package com.cn.util;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class BeanUtilsIgnoreNull {
    public static String[] getNullPropertyNames(Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

        Set<String> emptyNames = new HashSet<String>();
        for (java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            if (srcValue == null) emptyNames.add(pd.getName());
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }

    public static String[] getNullPropertyNames(Object source, String... ignore) {
        String[] nullPropertyNames = getNullPropertyNames(source);
        Set<String> set = new HashSet(Arrays.asList(nullPropertyNames));
        if (null != ignore) {
            for (String s : ignore) {
                set.add(s);
            }
        }
        String[] result = new String[set.size()];
        return set.toArray(result);
    }
}
